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FOXO1 regulates expression of a microRNA cluster on X chromosome

Ruchi Singhal1, Jonathan E Bard, Norma J Nowak

  • 1Department of Cell Stress Biology, Roswell Park Cancer Institute, BLSC L3-318, Buffalo, NY 14263, USA.

Aging
|June 11, 2013
PubMed

Insights

The Phosphoinositol-3-kinase (PI3K)/Akt pathway regulates gene expression via FOXO1 transcription factors. This study identifies novel microRNAs (miRNAs) controlled by FOXO1, suggesting their role in cancer and as biomarkers.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The Phosphoinositol-3-kinase (PI3K) pathway, including the protein kinase Akt, is vital in cellular functions and diseases like cancer and diabetes.
  • Akt influences gene transcription partly through the inhibitory phosphorylation of FOXO transcription factors.
  • While FOXO-regulated protein-coding genes are studied, non-coding RNA genes, like microRNAs (miRNAs), are increasingly recognized as important targets.

Purpose of the Study:

  • To investigate FOXO1-dependent changes in miRNA expression in human cells.
  • To identify novel miRNAs regulated by the PI3K/Akt/FOXO1 signaling axis.
  • To explore the potential role of these miRNAs in cancer biology and as biomarkers.

Main Methods:

  • Utilized a regulated form of FOXO1 to profile miRNA expression changes.
  • Employed microarray hybridization and next-generation sequencing for comprehensive analysis.
  • Investigated miRNA regulation in cancer cell lines upon PI3K inhibition.

Main Results:

  • Identified significant changes in miRNA expression from a specific cluster on the X chromosome.
  • Observed rapid induction of these miRNAs, independent of new protein synthesis.
  • Demonstrated derepression of these miRNAs upon PI3K inhibition in cancer cells, consistent with FOXO1 regulation.
  • Found overrepresentation of oncogenic cascade members among predicted miRNA targets, supporting a tumor-suppressive role for FOXO1.

Conclusions:

  • Discovered novel miRNAs regulated by FOXO1, expanding the understanding of PI3K/Akt signaling.
  • These miRNAs are potential mediators of FOXO1 functions and may serve as biomarkers for FOXO1 activity.
  • The findings suggest a role for these miRNAs in tumor suppression and cancer development.

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